Correct Option
The correct option is Cumulus clouds.
Explanation
In an extra-tropical cyclone (temperate cyclone), distinct weather patterns develop along the boundaries where warm and cold air masses meet. These boundaries are known as fronts. The type of cloud formation depends on the slope of the front and the rate at which the warm air is lifted.
Analysis of Cloud Formation at Fronts
- Cold Front: At a cold front, a dense, heavy cold air mass advances and wedges itself underneath a lighter warm air mass. This creates a steep frontal slope (typically 1:50 to 1:100). The warm air is forced to rise rapidly and vertically. This vigorous uplift leads to the development of vertically stacked clouds, such as Cumulus and Cumulonimbus. These clouds are associated with short-duration but heavy rainfall, thunderstorms, and lightning.
- Warm Front: At a warm front, warm air moves over a retreating cold air mass. The slope is much gentler. The warm air rises slowly over a long distance, leading to the formation of horizontally developed, stratified clouds. The sequence typically observed is Cirrus, Cirrostratus, Altostratus, and Nimbostratus (Stratus types).
- Comparison: Therefore, Stratus and Cirrus clouds are characteristic of the warm front sector, while Cumulus clouds are characteristic of the cold front sector.
Key Takeaway: Cold fronts are associated with a steep slope and rapid uplift, producing Cumulus or Cumulonimbus clouds. Warm fronts have a gentle slope, producing widespread Stratus and Cirrus clouds.